An optical recording medium wherein a recording layer, an absorbent layer and a radiating layer are provided in this order as seen from a recording/reproducing light incidence side and recording/reproduction is carried out on a condition that an extinction coefficient k of the absorbent layer is k>0 in a wavelength of recording/reproducing light, and a relationship between a wavelength &lgr; of the recording/reproducing light and a numerical aperture NA of an irradiating optical system of the recording/reproducing light is &lgr;/NA≦680 nm. An optical recording medium wherein an absorbent layer and a recording layer are provided in this order as seen from a recording/reproducing light incidence side and an extinction coefficient k of the absorbent layer is k>0 in a wavelength of recording/reproducing light, and a signal including a minimum mark having a mark length Ms of MS≦0.17 &mgr;m is recorded.
Legal claims defining the scope of protection, as filed with the USPTO.
1. An optical recording medium comprising: a recording layer; an absorbent layer; and a radiating layer, wherein the recording layer, the absorbent layer and the radiating layer is provided in this order from a recording/reproducing light incidence side, wherein recording/reproduction is carried out on a condition that an extinction coefficient k of the absorbent layer is k>0 in a wavelength of recording/reproducing light, wherein a recording track pitch PT is set to PT 0.35 m.
2. The optical recording medium according to claim 1 , further comprising a second absorbent layer provided on a side of the recording layer closest to a recording/reproducing light incidence side, wherein an extinction coefficient k of the second absorbent layer is k>0 in a wavelength of recording/reproducing light, wherein a signal including a minimum mark having a mark length Ms of Ms 0.17 m is recorded.
3. The optical recording medium according to claim 1 , wherein the extinction coefficient k of the absorbent layer is 0.06 k 1.0.
4. The optical recording medium according to claim 1 , wherein the extinction coefficient k of the absorbent layer is 0.06 k 1.0.
5. The optical recording medium according to claim 2 , wherein the extinction coefficient k of the absorbent layer is 0.06 k 1.0.
6. An optical recording medium comprising: an absorbent layer; and a recording layer having at least one recording mark having a mark length M s of M s 0.17 m, wherein the absorbent layer and the recording layer is provided in this order from a recording/reproducing light incidence side, wherein an extinction coefficient k of the absorbent layer is k>0 in a wavelength of recording/reproducing light.
7. The optical recording medium according to claim 6 , wherein the extinction coefficient k of the absorbent layer is 0.06 k 1.0.
8. A method of recording on an optical recording medium, the method comprising: recording on the medium using an irradiating optical system having a wavelength of recording light and a numerical aperture of the optical recording system satisfying the relationship /NA 680 nm, wherein the optical recording medium comprises a recording layer, an absorbent layer, an irradiating layer, the absorbent layer and radiating layer provided in this order from a recording light incident side, and an extinction coefficient k of the absorbent layer is k 0 in a wavelength of the recording reproducing light.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
April 19, 2002
March 16, 2004
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